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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 27 July 2026

Tonight and Tuesday.

Wind southeast 10 knots veering to southwest 10 near midnight then becoming variable 10 early Tuesday morning. Wind increasing to north 15 near noon Tuesday.

Scattered showers with a risk of thunderstorms.

Waves

Issued 06:30 PM EDT 27 July 2026
Tonight and Tuesday. Waves 0.5 metres or less building to 0.5 to 1 Tuesday afternoon.

Extended Forecast

Issued 06:30 PM EDT 27 July 2026
Wednesday Wind northeast 15 knots backing to north 15 to 20 in the morning then becoming north 15 late in the day.
Thursday Wind north 15 knots diminishing to light.
Friday Wind light.

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Map of Great Lakes - Lake Huron marine weather areas Wiarton Airport Western Islands Cove Island Goderich Lake Simcoe Regional Airport Vineland Station Parry Sound Harbour Sarnia Chris Hadfield Airport Tobermory Muskoka Airport Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Lagoon City Southeast Shoal Burlington Lift Bridge Welland-Pelham Windsor Airport Port Colborne Erieau Peterborough Municipal Airport CFB Trenton Toronto City Centre Airport Point Petre Oshawa Executive Airport Hamilton Munro Int'l Airport Point Pelee Cobourg Port Colborne - 45142 North Channel - 45154 Ajax - 45159 Lake Nipissing - 45152 Sault Ste. Marie Airport Killarney Lake Simcoe - 45151 Greater Sudbury Airport South Lake Huron - 45149 Lake St Clair - 45147 North Bay Airport South Georgian Bay - 45143 Gore Bay-Manitoulin Airport Grimsby - 45139 Georgian Bay - 45137 Great Duck Island Collingwood Kingston Airport Grenadier Island Brockville Prince Edward Point - 45135 Port Stanley - 45132
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Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.
Warnings

Watches (In effect)

Squall watch in effect

Western Lake Ontario

Issued 6:38 PM EDT 27 July 2026 Thunderstorms will be capable of producing wind gusts up to 40 knots and small hail this evening.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 27 July 2026 Tonight and Tuesday At 6:30 p.m. EDT tonight low 1002 mb located over eastern Wisconsin.
By 6:30 p.m. EDT Tuesday low 999 mb located over eastern Lake
Ontario.

At 6:30 p.m. EDT tonight ridge located on a line north-south over
northwestern Ontario.
By 6:30 p.m. EDT Tuesday ridge located on a line north-south over
Lake Superior.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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